Shimano motor noise - make it quieter?

[Steven1980]

I have just got my Mondraker E-crusher and am finding the motor nosie on hills a bit annoying. Has anyone got any tips for making ti quieter?

Foam inside the motor house for example?

 

[johnc]

Like tinnitus you get use to it!

 

[ottoshape]

You can use dynamat on strategic locations to combat sound from the motor and sound transmitted through the frame. For the former, place suitably sized strips on the bottom of the motor. Mine are about 25mmx60mm along the centerline. For the latter, you have to drop the motor and place narrow strips longitudinally inside the frame tubes. See if 25mmx50mm strips will fit and not cause any binding for wires or restrict your dropper post height.

While you have the motor out, use that opportunity to place more narrow strips in suitable locations on the motor housing. Don't cover any labels or screws. Dynamat isn't permanent but it will ruin stickers and removal is not easy. Remember, dynamat does not require 100% coverage to dampen sound.

 

[Steven1980]

thanks for the info - did it give a noticeable improvement?

 

[ottoshape]

thanks for the info - did it give a noticeable improvement?

It is noticeable but not miraculous... You can get small pieces/door kits from your local stereo installation shop and spend very little on the material. For the investment, I believe it is a worthwhile mod.

 

[Steven1980]

ok, i will give it a go ...

 

[R120]

Is that going to have any effect on the heat management of the motor though?

 

[Steven1980]

you need to think about it when applying it, i understand the motor has a high temperature trip if it does get too hot

 

[R120]

Yes it should cut out if it overheats, though I have never heard of anyone managing to do this. It is surprising how hot EMTB motors can get though

 

[stiv674]

Would it affect the warranty if you then had a motor issue?

 

[Spiff]

Dynamat is a thick and heavy film that adds weight to a
vibrating surface, and this extra weight reduces the vibration of the surface thus dampening the noise coming from it. Summarizing, you are adding weight to your bike, so be careful

 

[Gary]

Switch it off.

I get a funny feeling you'll soon stop moaning about the noise

 

[ottoshape]

Is that going to have any effect on the heat management of the motor though?

You are not covering the motor with dynamat. Just a couple/few thin strips in strategic locations and on locations that do not interfere with the dust/dirt covers on the motor. IMHO, the frame amplifies a lot of the motor noise and careful application in strategic spots may reduce it.

Or...

You can get used to the whine and just ride.